People are generally attracted to familiarity if they are risk adverse and to unfamiliarity if they are risk seeking. That covers the majority of the implicit racial bias (or preference but doesn't meet the bar of actual racism. No more than a person is ageist for being more attracted to younger or older people. No more than a person is heightist for being more attracted to taller or shorter people. No more than a person is fat/thin shaming for being more attracted to larger or smaller builds.